Are TWO killers at large? Joanna murder police refuse to rule out sexual motive as they hunt for mystery 4x4

'I am keeping an open mind,' says detective leading huntSexual motive not ruled outAppeal to trace light-coloured 4x4 vehicle seen near where body was foundWomen in Bristol area warned not to go out alone after dark In love: Joanna Yeates, with boyfriend Greg Reardon. He said she was 'one of the most lovely and genuine people to grace this Earth' More than one suspect could be involved in